[PATCH 08/27] HID: wacom: put the managed resources in a group

Benjamin Tissoires
2016-07-05T14:40:00Z

We currently have a complex clean_inputs() function while this can be
handled all by devres. Set a group that we can destroy in wireless_work().

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
drivers/hid/wacom.h | 1 +
drivers/hid/wacom_sys.c | 69 +++++++++++++++++++++----------------------------
drivers/hid/wacom_wac.c | 2 +-
drivers/hid/wacom_wac.h | 3 ---
4 files changed, 32 insertions(+), 43 deletions(-)

diff --git a/drivers/hid/wacom.h b/drivers/hid/wacom.h
index a968fbb..6f5555f 100644
--- a/drivers/hid/wacom.h
+++ b/drivers/hid/wacom.h
@@ -131,6 +131,7 @@ struct wacom {
struct power_supply_desc ac_desc;
struct kobject *remote_dir;
struct attribute_group remote_group[5];
+ bool resources;
};

static inline void wacom_schedule_work(struct wacom_wac *wacom_wac,
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index da2fccf..08f6d1f 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -1394,34 +1394,6 @@ static struct input_dev *wacom_allocate_input(struct wacom *wacom)
return input_dev;
}

-static void wacom_clean_inputs(struct wacom *wacom)
-{
- if (wacom->wacom_wac.pen_input) {
- if (wacom->wacom_wac.pen_registered)
- input_unregister_device(wacom->wacom_wac.pen_input);
- else
- input_free_device(wacom->wacom_wac.pen_input);
- }
- if (wacom->wacom_wac.touch_input) {
- if (wacom->wacom_wac.touch_registered)
- input_unregister_device(wacom->wacom_wac.touch_input);
- else
- input_free_device(wacom->wacom_wac.touch_input);
- }
- if (wacom->wacom_wac.pad_input) {
- if (wacom->wacom_wac.pad_registered)
- input_unregister_device(wacom->wacom_wac.pad_input);
- else
- input_free_device(wacom->wacom_wac.pad_input);
- }
- wacom->wacom_wac.pen_input = NULL;
- wacom->wacom_wac.touch_input = NULL;
- wacom->wacom_wac.pad_input = NULL;
- wacom->wacom_wac.pen_registered = false;
- wacom->wacom_wac.touch_registered = false;
- wacom->wacom_wac.pad_registered = false;
-}
-
static int wacom_allocate_inputs(struct wacom *wacom)
{
struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
@@ -1464,7 +1436,6 @@ static int wacom_register_inputs(struct wacom *wacom)
error = input_register_device(pen_input_dev);
if (error)
goto fail;
- wacom_wac->pen_registered = true;
}

error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
@@ -1477,7 +1448,6 @@ static int wacom_register_inputs(struct wacom *wacom)
error = input_register_device(touch_input_dev);
if (error)
goto fail;
- wacom_wac->touch_registered = true;
}

error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
@@ -1490,18 +1460,14 @@ static int wacom_register_inputs(struct wacom *wacom)
error = input_register_device(pad_input_dev);
if (error)
goto fail;
- wacom_wac->pad_registered = true;
}

return 0;

fail:
wacom_wac->pad_input = NULL;
- wacom_wac->pad_registered = false;
wacom_wac->touch_input = NULL;
- wacom_wac->touch_registered = false;
wacom_wac->pen_input = NULL;
- wacom_wac->pen_registered = false;
return error;
}

@@ -1612,6 +1578,22 @@ static void wacom_update_name(struct wacom *wacom, const char *suffix)
"%s%s Pad", name, suffix);
}

+static void wacom_release_resources(struct wacom *wacom)
+{
+ struct hid_device *hdev = wacom->hdev;
+
+ if (!wacom->resources)
+ return;
+
+ devres_release_group(&hdev->dev, wacom);
+
+ wacom->resources = false;
+
+ wacom->wacom_wac.pen_input = NULL;
+ wacom->wacom_wac.touch_input = NULL;
+ wacom->wacom_wac.pad_input = NULL;
+}
+
static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
{
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
@@ -1624,9 +1606,14 @@ static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
if (features->pktlen > WACOM_PKGLEN_MAX)
return -EINVAL;

+ if (!devres_open_group(&hdev->dev, wacom, GFP_KERNEL))
+ return -ENOMEM;
+
+ wacom->resources = true;
+
error = wacom_allocate_inputs(wacom);
if (error)
- return error;
+ goto fail_open_group;

/*
* Bamboo Pad has a generic hid handling for the Pen, and we switch it
@@ -1733,6 +1720,8 @@ static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
wacom_wac->shared->touch_input = wacom_wac->touch_input;
}

+ devres_close_group(&hdev->dev, wacom);
+
return 0;

fail_quirks:
@@ -1748,6 +1737,8 @@ fail_battery:
fail_shared_data:
fail_parsed:
fail_allocate_inputs:
+fail_open_group:
+ wacom_release_resources(wacom);
return error;
}

@@ -1773,14 +1764,14 @@ static void wacom_wireless_work(struct work_struct *work)
wacom1 = hid_get_drvdata(hdev1);
wacom_wac1 = &(wacom1->wacom_wac);
wacom_destroy_leds(wacom1);
- wacom_clean_inputs(wacom1);
+ wacom_release_resources(wacom1);

/* Touch interface */
hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
wacom2 = hid_get_drvdata(hdev2);
wacom_wac2 = &(wacom2->wacom_wac);
wacom_destroy_leds(wacom2);
- wacom_clean_inputs(wacom2);
+ wacom_release_resources(wacom2);

if (wacom_wac->pid == 0) {
hid_info(wacom->hdev, "wireless tablet disconnected\n");
@@ -1835,9 +1826,9 @@ static void wacom_wireless_work(struct work_struct *work)

fail:
wacom_destroy_leds(wacom1);
- wacom_clean_inputs(wacom1);
+ wacom_release_resources(wacom1);
wacom_destroy_leds(wacom2);
- wacom_clean_inputs(wacom2);
+ wacom_release_resources(wacom2);
return;
}

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index c7707b2..3e2c903 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1941,7 +1941,7 @@ static int wacom_bpt3_touch(struct wacom_wac *wacom)
}

/* only update touch if we actually have a touchpad and touch data changed */
- if (wacom->touch_registered && touch_changed) {
+ if (wacom->touch_input && touch_changed) {
input_mt_sync_frame(wacom->touch_input);
wacom->shared->touch_down = wacom_wac_finger_count_touches(wacom);
}
diff --git a/drivers/hid/wacom_wac.h b/drivers/hid/wacom_wac.h
index 53d1653..d5b973d 100644
--- a/drivers/hid/wacom_wac.h
+++ b/drivers/hid/wacom_wac.h
@@ -234,9 +234,6 @@ struct wacom_wac {
struct input_dev *pen_input;
struct input_dev *touch_input;
struct input_dev *pad_input;
- bool pen_registered;
- bool touch_registered;
- bool pad_registered;
int pid;
int battery_capacity;
int num_contacts_left;
--
2.5.5